Air-operable lock for power reversing gears



' Jam s. H. HUNTER AIR OPERABLE LOCK FOR POWER REVERS I NG GEARS s Sheets-Sheet Eiled Aug. 14, 1924 Q &

Jan. 29, 1929.

S. H. HUNTER AIR OPERABLE LOCK FOR POWER REVERSING GEARS Filed Aug. 14, 1924 3 Sheets-Sheet 2 m w Z 3 u an E l H l I x l H 5 u 1 3 I M R R &

v qk R i Jan. 29, 1929.

' S. H. HUNTER AIR OPERABLE LOCK FOR POWER REVERSING Guns Filed Aug. 14. 1924 :s Shets-Shet 5. H. Hunter;

Patented Jan. 29, was.

smrrn E. HUNTER, or MEMPHIS, rmmassnn. Q

AIR-OPERABLEI LOCK r03 rowan anvnitsms GEARS.

Application filed August 14,1924. Serial No. 732,104.

- issued to me on November 28, 1916, and in my pending application for Letters vPatent coverln a reversing gear for locomotive engines erial Number 519,242, filed December 1, 1921, and for devices of this general class and theirequi valent, generally.

It is particularly aimed to provide a novel construction wherein the parts of the gear may be held absolutely still and inactive while the engine or the like is running in order to eliminate creeping which is the greatest objection to all devices of this sort;

Themore particular objects and advan- 'tages will become apparent from a considera tion of the description following taken in connection. with the accompanying drawings illustrating an operative embodiment. In said drawings Figure -1 is a view of the apparatus in elevation;

Figure Figure 3 is a sectional view line 33 of Figure 1;,v v

Figure 4 is a side elevation of the locking parts on an enlarged scale; a 9

Figure '5 is an. elevation of the parts m Figure 4taken at a right angle thereto;

Figure 6'is a detail vertical sectional view taken through the lock on the line 6-6 of Figure 4; and Figure? is a sectional detail on a plane indicatedby the llne 77 of Figure 1. 7 I

Like reference characters designate like or similar partsin the different views. r Y 1 Referring specifically to said drawings, 10 designates a rod slidable in oppositedirections to control the position of the reverse 2 is a plan view thereof;

taken -on the gear or mechanism (not shown) of a locomotive engine. The piston is provided on the rod 10 at '11 and operates in a cylinder 12. The numeral 17 designates a slidable. cross head which is connected to the rod 10 and'has a stud 18 projecting laterally therefrom. Said stud 18 projects through an elongated slot 20 of alink or arm 19. An arm 21, which may be integral with the cylinder 12 has its outer end formed into a bearing block 22 for atransverse pivot rod or shaft 25. A

link 26 is pivoted at 27 to the arm 19 and is pivotally connected to a crank arm on the shaft 25. A crank arm 30 is rigidly connected to shaft 25 and is adapted to be rocked in'any'suita'ble way; As shown, a; link- 81 is pivoted theretoa-t S2 and at 33 to a lever 34 pivoted at35 to a bracket 36mounting a quadrantor toothed sector 37 withthe teeth of which, a conventionalylocking plunger 38 of thelever is associated. A bearing. lug 39 rises from and is preferably integralwith the arm 21. Said lug ;39 slidably mounts a shifting rod 40 which ispivoted to the link19 at 41. Associated with the cylinder at 12 is a means whereby fluid, such as steamor air,

may be admitted under valve controlflto the cylinder 11. Such means is-shown' at 49 gen- 1 erally and its valves arejadapted tofzbe. actu-' ated by arms or lugs 42 and 42 carried by the rod 40. i

The mechanism described is substantially that disclosed in my pending application 519,242 aforesaid and the same }reference characters apply inthis case as insaid application and in view of theflatter, a more detailed description. is unnecessary. The operation is the same as disclosedin said appli-' cation, i

I I It isto be noted however that the upper end of the arm 21 is somewhat diiferentlfro'm thatdisclosed in the applicationinorder thatstuds 50 may be formed integral with said arm and adjustably mount such screws. 51 which limit the swinging movement of thelink 30 by; directengagement with a dependent 52 on shaft 25;

l The present invention a'lock mechanism whereby the'cr'oss'headl? and associated part may be held absolutely stillwhile the engine or machine is being deals primarily with i run so as to eliminate creeping. To this end,

a bar 53 is fastened at ,54 to the cross head 17'.

Bar 53 moves with the cross head and slides I through the arm 21 andalong its-upper, surface is provided with teeth 55 so that itmay constitute a lockingvbar. i Y

The; cylinder 12 may have shelf 56 integral therewith or attached thereto and on the upper surface of which the bar 53 directly slides. suitable casing generally designated 57 is secured to the bracket a bracket or 56 and carries latch mechanism to coact with the locking bar 53. Specifically, casing 57 has lower sections 58 which are separated at 7 a to the teeth and adapted for meshing therewith when the partsv are locked.

Mounting the sections 58 is a casing section 64 secured to the sections 58 as by bolts or the like 65 and coacting flanges 66 on the section. Sections 64 provide a cylinder 65 in "which'a piston or plunger 66 is slidable.

Latch 62 has a stem 67 which is rigidly and detachably secured as by a bolt at 68 to the plunger 66. The bolt 68 secures against the upper face of the plunger, a cup shape leather or equivalent washer 69. An expansive spring 70 within the casing surrounds the stem 67 abutting the plunger 66 at one end and shoulders 77 within offset 72 of the sec tions 58,-at the other end. This spring therefore urges upward movement of the latch 62 so as to disengage the teeth 63 from the teeth 55, when however, the piston 66 is not subject to pressure from above;

Casing section 64 has a receiving chamber 71 fora power fluid to act on the piston 66 so as to depress the latch 62 into depending engagement with the locking bar 53 and this chamber communicates with the cylinder 65 through a port 72 through a wall of the section 64 between the cylinder and chamber 71. The top wall of section 64 has a port therethrough in communication with a supply pipe 73 for a power medium, such as compressed air and it is in preferably, constant communication with and subject to such compressed air and such source of compressed air is preferably the same source as that which supplies the air'or operating fluid to the cylinder 11.

' Side plates 74 close the chamber 71 at the sides,being preferably bolted to, section 64 as at 7 5. Each plate 74 has a'port 76 therethrough adapted to be normally closed by valves 7 7 Said valves have stems 78 of less diameter than the port and extending through the same and outwardly beyond said plate. Outwardly of the chamber, expansive springs 79 surround the stems 78 bearing at one end against the plate 74 and at the other end against abutment disks 80, detachably fastened on the stems 78.

Said stems 78, as best shown in Figure 2, are arranged with theiraxes in alinement longitudinally of the device and between the .arms 81 of a yoke 82 fastened on the rod 40,

so that such stems 78 will be pressed against one at a time by the arms 81, according to the distance, say one-sixteenthof an inch, before the valves of mechanism 49 are operated by the arms 42 and 42;

In operation, the device as a whole is operated as in my pending application aforesaid. As the piston 11 travels forward, through manual manipulation of lever 34, the rod 40 travels backward, and as said piston travels backward, the valve stem travels forward. This movement causes the cross head 17 to correspondingly move the locking bar 53 and the arms 81 according to the direction of movement, to engage valve stems 78 andslide the valves 77 to open position, before the valves of the mechanism 49 are engaged by the arms 42 and 42. The opening of either of the valves 77 exhausts the pressure within the chamber 71 and hence the tension of the spring 70, which is normally overcome by the pressure, is free and immediately works to elevate the latch 62 out of engagement with the bar 53. l/Vhen the mechanism is in proper suggested position, the arms 81 will be in released position with respect to the valves 77 and the latter will be closed so that the air pressure will slidethe latch 62 downwardly and maintain it in engagement with the lock.- ing bar 53.

lVhat is claimed is V v 1. A locking device fora control rod of gear reverse mechanism comprising a locking bar movable with said rod, a casing having a chamber for power medium, a latch disposed in said casing, means to urge said latch to an inoperative position, a piston on the latch subject to the action of the power medium to move the latch into engagement with said locking bar, substantially alined valves normally closing said chamber, a yoke between which the valves are disposed to engage said valves one at a time according to the direction,

of movement of the control rod in order to open them to exhaust the power medium, and means to operate the second mentioned rod from the control rod. Y

2. A locking device for a control rod of gear reverse mechanism, comprising a casing having a slot, a locking bar slidable through said slot, a vertical latch slidable in said casing to engage and disengage said bar, a piston on said latch, said casing having a cylinder in which said piston moves, an expansive spring surrounding the latch engaging said piston at one end and said casing at the other end, said casing having a chamber to receive power fluid, said chamber being in communication with said cylinder, substantially alined valves carried by the casing and normally in closing relation with the chamber, a yoke between which the valves are disposed to actuate said valves from the control rod one at a time and according to the direction of movement thereof in order to exhaust the power medium from said chamber and permit said spring to move the latch out of locking engagement with the a locking member;

In testimony whereof aflix my signature. 7 h I SMITH H. HUNTER; 

